PLATE V. 



COMAROCYSTITES PUNCTATUS (page 61). 



Figure 1. Anterior view of a large specimen, with one arm and the pinnulse attached. 



0, the mouth, 

 la. A plate of the same, enlarged, to shew the peculiar striation. 

 15. The valvular apparatus of the mouth, enlarged. 

 2. View of the left side of another specimen. 

 2a. A plate of same, enlarged. 

 2b. Outline of the summit, shewing the positions of the bases of the arms, and 



the ambulacral groove between them. 



Dr. E. Van Cortlandt of Ottawa, has kindly sent me from his cabinet two of the best 

 specimens of C. punctatus that I have yet seen, both of which have the mouth furnished 

 with six valves instead of five, and it thus appears that the number is variable as it is 

 in the Orinoid Caryocrinus ornatus (Say). Where the plates are very perfect they are 

 striated in the manner represented by fig. 2a, and the ridges between the plates are quite 

 sharp and imperforate. It is probable, therefore, that in no case are the pores visible 

 externally, unless where the surface is worn. This latter fact, first clearly exhibited by 

 Dr. Van Cortlandt's specimens, shews that Camarocystites and Palaocystites are closely 

 allied genera. 



These specimens did not reach me until after the foregoing sheets had been printed, 

 otherwise they would have been noticed in the body of the work. 



